作业要求： http://www.cnblogs.com/bingc/p/4919692.html
代码（未使用Eigen）：
#include <iostream>
#include <Eigen/Dense>
using namespace Eigen;
using Eigen::MatrixXd;
using namespace std;
class POINT
{
public:
string name;
double x, y;
};
class LINE
{
public:
string name;
POINT p_start,p_end;
};
class TRIANGLE
{
public:
string name;
POINT p1,p2, p3;
};
void rotate(POINT *pt, double angle);
int main()
{ string name,cmd,name1;
int num;
, l = , t = ;
;
POINT point[maxnum];
LINE line[maxnum];
TRIANGLE triangle[maxnum];
int flag;
char a, b, c;
double x, y, angle;
)
{
cout << "存点、线、三角形，请输入0，操作点、线、三角形请输入1" << endl;
cin >> flag;
switch (flag)
{
:{
cout << "请输入图形名称 点数 坐标" << endl;
cin >> name;
cin >> num;
switch (num)
{
:
{
if (p >= maxnum) { cout << "您的点的个数已达上限，不能再存!" << endl; break; }
point[p].name = name;
cin >> a >> point[p].x >> b >> point[p].y >> c;
p++;
break;
}
:
{
if (l >= maxnum) { cout << "您的线的个数已达上限，不能再存!" << endl; break; }
line[l].name = name;
cin >> a >> line[l].p_start.x >> b >> line[l].p_start.y >> c >> a >> line[l].p_end.x >> b >> line[l].p_end.y >> c;
l++;
break;
}
:
{
if (t >= maxnum) { cout << "您的三角形的个数已达上限，不能再存!" << endl; break; }
triangle[t].name = name;
cin >> a >> triangle[t].p1.x >> b >> triangle[t].p1.y >> c >> a >> triangle[t].p2.x >> b >> triangle[t].p2.y >> c >> a >> triangle[t].p3.x >> b >> triangle[t].p3.y >> c;
t++;
break;
}
default: {cout << "点数输入错误" << endl; break; }
}
break;
}
:{
cout << "请输入操作指令" << endl;
cin >> cmd;
cin>> name1;
if (cmd == "move")
{
cin >> a >> x >> b >> y >> c;
; i < p; i++)
{
if (name1 == point[i].name)
{
point[i].x += x;
point[i].y += y;
cout << "平移后的点为" << "(" << point[i].x << "," << point[i].y << ")" << endl;
}
}
; i < l; i++)
{
if (name1 == line[i].name)
{
line[i].p_start.x += x;
line[i].p_start.y += y;
line[i].p_end.x += x;
line[i].p_end.y += y;
cout << "平移后的线段端点为" << "(" << line[i].p_start.x << "," << line[i].p_start.y << ")" << "、(" << line[i].p_end.x << "," << line[i].p_end.y << ")" << endl;
}
}
; i < t; i++)
{
if (name1 == triangle[i].name)
{
triangle[i].p1.x += x;
triangle[i].p1.y += y;
triangle[i].p2.x += x;
triangle[i].p2.y += y;
triangle[i].p3.x += x;
triangle[i].p3.y += y;
cout << "平移后的三角形顶点为为" << "(" << triangle[i].p1.x << "," << triangle[i].p1.y << ")" << "、(" << triangle[i].p2.x << "," << triangle[i].p2.y << ")" << "、(" << triangle[i].p3.x << "," << triangle[i].p3.y << ")" << endl;
}
}
}
else if (cmd == "rotate")
{
cin >> angle;
; i < p; i++)
{
if (name1 == point[i].name)
{
rotate(&point[i], angle);
cout << "旋转后的点为" << "(" << point[i].x << "," << point[i].y << ")" << endl;
}
}
; i < l; i++)
{
if (name1 == line[i].name)
{
rotate(&line[i].p_start, angle);
rotate(&line[i].p_end, angle);
cout << "旋转后的直线端点为" << "(" << line[i].p_start.x << "," << line[i].p_start.y << ")" << "、(" << line[i].p_end.x << "," << line[i].p_end.y << ")" << endl;
}
}
; i < t; i++)
{
if (name1 == triangle[i].name)
{
rotate(&triangle[i].p1, angle);
rotate(&triangle[i].p2, angle);
rotate(&triangle[i].p3, angle);
cout << "旋转后的三角形顶点为为" << "(" << triangle[i].p1.x << "," << triangle[i].p1.y << ")" << "、(" << triangle[i].p2.x << "," << triangle[i].p2.y << ")" << "、(" << triangle[i].p3.x << "," << triangle[i].p3.y << ")" << endl;
}
}
}
else cout << "comand is error!" << endl;
break;
}
default:{cout << "输入错误！" << endl; break; }
}
}
;
}
void rotate(POINT *pt, double angle) //逆时针为正
{
double x, y,ang;
x = pt->x;
y = pt->y;
ang = angle*;
pt->x = x*cos(ang) - y*sin(ang);
pt->y = x*sin(ang) + y*cos(ang);
}
运行结果：
